{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T12:37:05Z","timestamp":1740141425712,"version":"3.37.3"},"reference-count":24,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2014,12,17]],"date-time":"2014-12-17T00:00:00Z","timestamp":1418774400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"crossref","award":["R21 HD065807"],"award-info":[{"award-number":["R21 HD065807"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100005627","name":"Thrasher Research Fund","doi-asserted-by":"crossref","award":["#9181"],"award-info":[{"award-number":["#9181"]}],"id":[{"id":"10.13039\/100005627","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Maternal &amp; Child Nutrition"],"published-print":{"date-parts":[[2016,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Birth certificates are an important source of pre\u2010pregnancy body mass index (<jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>) and gestational weight gain (<jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content>) data for surveillance and aetiologic studies, but little is known about their validity in twin pregnancies. Twins experience high rates of adverse perinatal outcomes that have been associated with <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> in singletons. Our objective was to evaluate the accuracy of birth certificate\u2010derived pre\u2010pregnancy <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> compared with medical record\u2010derived data in a sample of 186 twin pregnancies at a teaching hospital in Pennsylvania (2003\u20132010). Twelve strata were created by simultaneous stratification on pre\u2010pregnancy BMI (underweight, normal weight\/overweight, obese class 1, obese classes 2 and 3) and <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> (&lt;20th, 20\u201380th, &gt;80th percentile). The agreement of birth certificate\u2010derived pre\u2010pregnancy BMI category with medical record BMI category was lowest among underweight mothers [75% (95% confidence interval 51\u201391%)\u2009] and highest among normal\/overweight [97% (90\u201399%)\u2009] and obese classes 2 and 3 mothers [97% (85\u201399%)\u2009]. Agreement for <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> category from the birth certificate varied from 57% (41\u201370%) for <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> &gt;80th percentile to 80% (65\u201391%) and 82% (72\u201389%) for <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> &lt;20th and 20th\u201380th percentiles, respectively. The misclassification of <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> was primarily due to error in pre\u2010pregnancy weight rather than weight at delivery or height. Agreement proportions for twins were not meaningfully different from the proportions in a comparable sample of singleton pregnancies. These data suggest that birth certificate\u2010based <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">GWG<\/jats:styled-content> data are prone to error in twin pregnancies. Those who use these data should conduct internal validation studies and adjust their results using bias analyses.<\/jats:p>","DOI":"10.1111\/mcn.12160","type":"journal-article","created":{"date-parts":[[2014,12,19]],"date-time":"2014-12-19T06:45:54Z","timestamp":1418971554000},"page":"632-638","source":"Crossref","is-referenced-by-count":4,"title":["Validity of birth certificate\u2010derived maternal weight data in twin pregnancies"],"prefix":"10.1111","volume":"12","author":[{"given":"Lisa M.","family":"Bodnar","sequence":"first","affiliation":[{"name":"Department of Epidemiology Graduate School of Public Health University of Pittsburgh  Pittsburgh Pennsylvania USA"},{"name":"Department of Obstetrics, Gynecology, and Reproductive Sciences School of Medicine University of Pittsburgh  Pittsburgh Pennsylvania USA"},{"name":"Magee\u2010Womens Research Institute  Pittsburgh Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Barbara","family":"Abrams","sequence":"additional","affiliation":[{"name":"Division of Epidemiology School of Public Health University of California at Berkeley  Berkeley California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lara","family":"Siminerio","sequence":"additional","affiliation":[{"name":"Department of Epidemiology Graduate School of Public Health University of Pittsburgh  Pittsburgh Pennsylvania USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timothy L.","family":"Lash","sequence":"additional","affiliation":[{"name":"Department of Epidemiology Rollins School of Public Health Emory University  Atlanta Georgia USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2014,12,17]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/oby.2010.25"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/ppe.12120"},{"key":"e_1_2_9_4_1","unstructured":"Centers for Disease Control and Prevention (CDC) National Center for Health Statistics(2003)Birth edit specifications for the 2003 proposed revision of the U.S. standard certificate of birth. Available at:http:\/\/www.cdc.gov\/nchs\/data\/dvs\/birth_edit_specifications.pdf"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dyi184"},{"issue":"2","key":"e_1_2_9_6_1","first-page":"1","article-title":"Births: preliminary data for 2013","volume":"63","author":"Hamilton B.E.","year":"2014","journal-title":"National Vital Statistics Reports"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0006-341X.1999.01193.x"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.3945\/ajcn.112.051706"},{"volume-title":"Nutrition during Pregnancy","year":"1990","author":"Institute of Medicine (IOM)","key":"e_1_2_9_9_1"},{"volume-title":"Weight Gain During Pregnancy: Reexamining the Guidelines","year":"2009","author":"Institute of Medicine (IOM)","key":"e_1_2_9_10_1"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-87959-8"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1097\/EDE.0000000000000102"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1022996924094"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1097\/EDE.0b013e31823b539c"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.3109\/14767058.2011.636099"},{"volume-title":"Births: Final Data for 2009","year":"2011","author":"Martin J.A.","key":"e_1_2_9_16_1"},{"volume-title":"Three Decades of Twin Births in the United States, 1980\u20132009","year":"2012","author":"Martin J.A.","key":"e_1_2_9_17_1"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10995-009-0544-4"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.3945\/ajcn.110.005306"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwn092"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1038\/oby.2009.479"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kws155"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.aje.a010103"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-3016.2009.01087.x"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10995-010-0724-2"}],"container-title":["Maternal &amp; Child Nutrition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Fmcn.12160","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/mcn.12160","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,2]],"date-time":"2023-10-02T02:23:01Z","timestamp":1696213381000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/mcn.12160"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,12,17]]},"references-count":24,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2016,7]]}},"alternative-id":["10.1111\/mcn.12160"],"URL":"https:\/\/doi.org\/10.1111\/mcn.12160","archive":["Portico"],"relation":{},"ISSN":["1740-8695","1740-8709"],"issn-type":[{"type":"print","value":"1740-8695"},{"type":"electronic","value":"1740-8709"}],"subject":[],"published":{"date-parts":[[2014,12,17]]}}}